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* WikiLambda Pinia store: Wikidata Items module
*
* @copyright 2020– Abstract Wikipedia team; see AUTHORS.txt
* @license MIT
*/
'use strict';
const Constants = require( '../../../Constants.js' );
const LabelData = require( '../../classes/LabelData.js' );
const { isWikidataQid } = require( '../../../utils/wikidataUtils.js' );
module.exports = {
state: {
items: {},
scheduledItems: [],
scheduledItemsPromise: null
},
getters: {
/**
* Returns the Wikidata Item data given its Id,
* the fetch Promise if the fetch request is on the fly,
* or undefined if it hasn't been requested yet.
*
* @param {Object} state
* @return {Function}
*/
getItemData: function ( state ) {
/**
* @param {string} id
* @return {Object|Promise|undefined}
*/
const findItemData = ( id ) => state.items[ id ];
return findItemData;
},
/**
* Returns a promise that resolves to the Wikidata Item data given its Id.
* If the item is already cached, returns a resolved promise.
* If the item is being fetched, returns the existing promise.
* If the item hasn't been requested, returns a rejected promise.
*
* @param {Object} state
* @return {Function}
*/
getItemDataAsync: function () {
/**
* @param {string} id
* @return {Promise<Object>}
*/
const getItemDataAsync = ( id ) => {
const itemData = this.getItemData( id );
// If item is already cached (not a promise), return resolved promise
if ( itemData && typeof itemData.then !== 'function' ) {
return Promise.resolve( itemData );
}
// If item is being fetched (is a promise), return that promise
if ( itemData && typeof itemData.then === 'function' ) {
return itemData;
}
// If item hasn't been requested, return rejected promise
return Promise.reject( new Error( `Item ${ id } not found` ) );
};
return getItemDataAsync;
},
/**
* Returns the LabelData object built from the available
* labels in the data object of the selected Wikidata Item.
* If an Item is selected but it has no labels, returns
* LabelData object with the Wikidata Item id as its label.
* If no Wikidata Item is selected, returns undefined.
*
* @param {Object} state
* @return {LabelData|undefined}
*/
getItemLabelData: function () {
/**
* @param {string} id The item ID
* @return {LabelData} The `LabelData` object containing label, language code, and directionality.
*/
const findItemLabelData = ( id ) => {
// If no selected item, return undefined
if ( !id ) {
return undefined;
}
// If no itemData yet, return item Id
// Get best label from labels (if any)
const itemData = this.getItemData( id );
const langs = itemData ? Object.keys( itemData.labels || {} ) : {};
if ( langs.length > 0 ) {
const label = langs.includes( this.getUserLangCode ) ?
itemData.labels[ this.getUserLangCode ] :
itemData.labels[ langs[ 0 ] ];
return new LabelData( id, label.value, null, label.language );
}
// Else, return item Id as label
return new LabelData( id, id, null );
};
return findItemLabelData;
},
/**
* Returns the URL for a given item ID.
*
* @param {Object} state
* @return {Function}
*/
getItemUrl: function () {
/**
* @param {string} id
* @return {string|undefined}
*/
const findItemUrl = ( id ) => isWikidataQid( id ) ?
`${ Constants.WIKIDATA_BASE_URL }/wiki/${ id }` :
undefined;
return findItemUrl;
}
},
actions: {
/**
* Stores the Wikidata item data indexed by its Id
*
* @param {Object} payload
* @param {string} payload.id
* @param {Object} payload.data
* @return {undefined}
*/
setItemData: function ( payload ) {
// If payload.data is a promise, store it directly
if ( payload.data && typeof payload.data.then === 'function' ) {
this.items[ payload.id ] = payload.data;
return;
}
// Otherwise, unwrap the data to select only subset of Wikidata Item data; title, labels and descriptions
const unwrap = ( { title, labels, descriptions } ) => ( { title, labels, descriptions } );
this.items[ payload.id ] = unwrap( payload.data );
},
/**
* Removes the items for the given IDs
*
* @param {Object} payload
* @param {Array<string>} payload.ids - An array of Wikidata Item IDs
*/
resetItemData: function ( payload ) {
payload.ids.forEach( ( id ) => delete this.items[ id ] );
},
/**
* Calls Wikidata Action API to fetch Wikidata Items
* given their Ids.
*
* @param {Object} payload
* @param {Array<string>} payload.ids - An array of Wikidata Item IDs to fetch.
* @return {Promise} - A promise that resolves to the fetched data.
*/
fetchItems: function ( { ids } ) {
this.scheduledItems = [ ... new Set( [ ...this.scheduledItems, ...ids ] ) ];
if ( !this.scheduledItemsPromise ) {
this.scheduledItemsPromise = new Promise( ( resolve, reject ) => {
setTimeout( () => {
this.fetchWikidataEntitiesBatched( {
ids: this.scheduledItems,
getData: this.getItemData,
setData: this.setItemData,
resetData: this.resetItemData
} ).then( resolve, reject );
this.scheduledItems = [];
this.scheduledItemsPromise = null;
}, Constants.WIKIDATA_REQUEST_TIME_WINDOW );
} );
}
return this.scheduledItemsPromise;
}
}
};
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